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List: ubuntu-security-announce
Subject: [USN-5174-1] Samba vulnerabilities
From: Marc Deslauriers <marc.deslauriers () canonical ! com>
Date: 2021-12-06 14:15:51
Message-ID: 06f7efef-7494-b0e6-719c-ceb0d21a2124 () canonical ! com
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==========================================================================
Ubuntu Security Notice USN-5174-1
December 06, 2021
samba vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 18.04 LTS
Summary:
Several security issues were fixed in Samba.
Software Description:
- samba: SMB/CIFS file, print, and login server for Unix
Details:
Stefan Metzmacher discovered that Samba incorrectly handled SMB1 client
connections. A remote attacker could possibly use this issue to downgrade
connections to plaintext authentication. (CVE-2016-2124)
Andrew Bartlett discovered that Samba incorrectly mapping domain users to
local users. An authenticated attacker could possibly use this issue to
become root on domain members. (CVE-2020-25717)
Andrew Bartlett discovered that Samba did not properly check sensitive
attributes. An authenticated attacker could possibly use this issue to
escalate privileges. (CVE-2020-25722)
Joseph Sutton discovered that Samba incorrectly handled certain TGS
requests. An authenticated attacker could possibly use this issue to cause
Samba to crash, resulting in a denial of service. (CVE-2021-3671)
The fix for CVE-2020-25717 results in possible behaviour changes that could
affect certain environments. Please see the upstream advisory for more
information:
https://www.samba.org/samba/security/CVE-2020-25717.html
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 18.04 LTS:
samba 2:4.7.6+dfsg~ubuntu-0ubuntu2.26
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-5174-1
CVE-2016-2124, CVE-2020-25717, CVE-2020-25722, CVE-2021-3671
Package Information:
https://launchpad.net/ubuntu/+source/samba/2:4.7.6+dfsg~ubuntu-0ubuntu2.26
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